the volcanic neck which is also known as the volcanic plug is a type of land form of the volcano which formed when lava from volcano hardened inside the vent of an active volcano. Due to hardened magma intense pressure is build up which sometimes become the cause of explosion in volcano
The beginning point for measuring latitude lines is the Equator. It is located at zero degrees and marks the dividing point between the north and south hemispheres. The zero-degree longitude line runs through Greenwich, England and is called the prime meridian<span>.